For this discussion, I am following Michael Saylor with his strong advocacy for Bitcoin as a store of value and a long-term investment asset. When he stated that "Bitcoin is the only best and there is no second contender" he likely expressed this view based on several key factors:

Store of Value: Saylor believes that Bitcoin's scarcity, decentralization, and security features make it an ideal store of value asset. He sees Bitcoin as digital gold, a hedge against inflation, and a long-term store of wealth.

Security: Thanks to its proof-of-work consensus mechanism and the massive amount of computational power securing the network. Saylor values this security feature as a critical aspect of Bitcoin's superiority.

Network Effects: Bitcoin has a strong network effect, with widespread adoption, recognition, and acceptance compared to other cryptocurrencies.

Longevity and Stability: Bitcoin has been in existence for over a decade and has demonstrated resilience and stability over time. Saylor may view Bitcoin's longevity and track record as factors that contribute to its status as the top cryptocurrency.

Lastly, Saylor often emphasizes Bitcoin's fixed supply of 21 million coins and its deflationary nature as key attributes that differentiate it from other cryptocurrencies. He values Bitcoin's predictable and transparent monetary policy.